#include<stdio.h>
#include"head.h"
int main()
{
    int a,b;
    printf("enter two numbers:");
    scanf("%d %d",&a,&b);
    printf("add:%d\n",add(a,b));
    printf("sub:%d\n",sub(a,b));
    printf("mul:%d\n",mul(a,b));
    printf("div:%lf\n",div(a,b));
    return 0;
}
